Back in 1989, I replaced my stock distributor in my 1970 Cadillac with HEI. It was a direct bolt in and I was able to retain the two fans belts that power the AC and PS.

A few months ago, the HEI unit failed : Shaft wobble and Pick up coil failure. I purchased a DUI distribuor wanting more performance. I installed the unit today and can't put the two belts back on the AC and PS with out them sitting untrue to the pulley as they rub against the cap. This didn't happen with the old unit at all. I was able to retain the dual belts with no problem what so ever. Do HEI's come in different sizes for Cadillac? Maybe the HEI cap from DUI is larger? This really sucks!

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